4 Yugas are collectively called as Chaturyuga .

1. Science of Manvantara • 4 Yugas are collectively called as Chaturyuga. • A span of 1000 such ‘Chaturyugas’ constitute (Manvantara) life period of the Earth, better to say Earth with life. • Earth’s life has been divided into 14 ‘life cycles’ of slightly more than 71 ‘Chaturyugas’

2. Science of Manvantara • Each life cycle is called as ‘Manvantara’. So far Earth is the only planet known to support ‘Life’. • Period for Each Manvantara is 30,84,48,000 years(308 Million Years). This is the time taken by our Solar System to complete one rotation in our Galaxy (Milky Way) and marks life cycle. • Modern scientists estimates this as 250 – 280 Million years

3. Vaivasvata (Present) 1851 – 2157 Mil. Years Chakshasa 1542 – 1851 Mil. Years Tamasa 1234 – 1542 Mil. Years Raivata 915 – 1234 Mil. Years Uttama 617 – 915 Mil. Years Swarochisha 308 – 617 Mil. Years Count of Manvantara, motion of solar system in Galaxy Swayambhuva 0 – 308 Mil. Years Solar System

4. Manvantaras • Swayambhuva – Period from 0 to 308 Million Years • Swarochisha – Period from 308 to 617 Million Years • Uttama – Period from 617 to 925 Million Years • Raivata – Period from 925 to 1234 Million years • Tamasa – Period from 1234 to 1542 Million years • Chakshasa – Period from 1542 to 1851 Million years • Vaivasvata – Period from 1851 to 2159 Million Years • So far 1972 Million years elapsed • Sāvarńi • Dakśha Sāvarńi • Brahma Sāvarńi • Dharma Sāvarńi • Rudra Sāvarńi • Rōchyadēva Sāvarńi • Indra Sāvarńi